I think it goes back and forth.
Disney Animation: (1989-1994) Little Mermaid, Beauty and the Beast, Aladdin and Lion King
Pixar: (1995-2010) Toy Story, Bug's Life, Toy Story 2, Monsters Inc., Finding Nemo, The Incredibles, Ratatouille, Wall-E, Up, Toy Story 3
Disney Animation: (2010-2017) Tangled, Wreck-It-Ralph, Frozen, Big Hero Six, Zootopia and Moana
However, Pixar did have Inside Out and Finding Dory in the past 2 years. The next few movies coming out for all their animation is Coco, The Incredibles 2 and Wreck it Ralph 2. So if Coco and Incredibles 2 are stellar with Inside Out and Finding Dory, the movies maybe starting to overlap.